Devices Useful In Imaging

ABSTRACT

Biopsy devices and methods useful with Positron Emission Tomography (PET) and Breast Specific Gamma Imaging (BSGI) are disclosed. A biopsy device including a flexible tube having a side aperture, and a PET or BSGI imageable material disposed within the flexible tube is disclosed. A biopsy method is disclosed that includes advancing a flexible tube having a PET or BSGI imageable material distally through the biopsy device. Various other embodiments and applications are disclosed.

This application claims priority to U.S. Provisional Application61/047,160 filed Apr. 23, 2008.

BACKGROUND

Biopsy samples have been obtained in a variety of ways using variousdevices. An exemplary biopsy device is the MAMMOTOME device from EthiconEndo-Surgery, Inc. of Cincinnati, Ohio. Further exemplary biopsy devicesare disclosed in U.S. Pat. No. 5,526,822, entitled “Method and Apparatusfor Automated Biopsy and Collection of Soft Tissue,” issued Jun. 18,1996; U.S. Pat. No. 6,086,544, entitled “Control Apparatus for anAutomated Surgical Biopsy Device,” issued Jul. 11, 2000; U.S. Pub. No.2003/0109803, entitled “MRI Compatible Surgical Biopsy Device,”published Jun. 12, 2003; U.S. Pub. No. 2007/0118048, entitled “RemoteThumbwheel for a Surgical Biopsy Device,” published May 24, 2007; U.S.Provisional Patent Application Ser. No. 60/869,736, entitled “BiopsySystem,” filed Dec. 13, 2006; U.S. Provisional Patent Application Ser.No. 60/874,792, entitled “Biopsy Sample Storage,” filed Dec. 13, 2006;and U.S. Non-Provisional patent application Ser. No. 11/942,785,entitled “Revolving Tissue Sample Holder for Biopsy Device,” filed Nov.21, 2007. The disclosure of each of the above-cited U.S. patents, U.S.Patent Application Publications, U.S. Provisional Patent Applications,and U.S. Non-Provisional patent application is incorporated by referenceherein. While many of the foregoing biopsy devices are configured toobtain biopsy samples from breast tissue, biopsy samples may also beobtained from various other locations.

Various biopsy devices may be designed to work with X-ray, ultrasound,and magnetic resonance imaging (MRI) as imaging modalities. Forinstance, various components for interfacing biopsy devices with variousimaging systems are disclosed in the following: U.S. Pub. No.2005/0261581, entitled “MRI Biopsy Device,” published Nov. 24, 2005;U.S. Pub. No. 2005/0277829, entitled “MRI Biopsy Apparatus Incorporatinga Sleeve and a Multi-Function Obturator,” published Dec. 15, 2005; U.S.Pub. No. 2005/0283069, entitled “MRI Biopsy Device LocalizationFixture,” published Dec. 22, 2005; U.S. Pub. No. 2007/0167736, entitled“MRI Biopsy Apparatus Incorporating an Imageable Penetrating Portion,”published Jul. 19, 2007; U.S. Pub. No. 2006/0241385, entitled “GuidedDisposable Fiducial for Breast Biopsy Localization Fixture,” publishedOct. 26, 2006; U.S. Pub. No. 2006/0258956, entitled “MRI Biopsy Device,”published Nov. 16, 2006; U.S. Pub. No. 2007/0255168, entitled “Grid andRotatable Cube Guide Localization Fixture for Biopsy Device,” publishedNov. 2, 2007; and U.S. Pub. No. 2007/0255170, entitled “Biopsy CannulaAdjustable Depth Stop,” published Nov. 1, 2007; and US Pub No.2008/0015429, “MRI Biopsy Device” published Jan. 17, 2008. Thedisclosure of each of the foregoing published patent applications isincorporated by reference herein.

It may be desirable in some settings to use one or more imagingmodalities other than X-ray, ultrasound, or MRI before, during, or aftera biopsy procedure. For instance, an alternative imaging modality mayinclude positron emission tomography (PET) imaging. In a mammographycontext, such imaging may be referred to as positron emissionmammography (PEM). Instead of scanning the entire body, PEM may be usedas a special form of PET for imaging breasts and other small body parts.This may allow for a more detailed image of abnormal tissue. In a PEMcontext, the patient may be injected with an intravenous substancecalled FDG (fluorodeoxyglucose), which is a glucose analog, which mayaccumulate in glucose avid cells. This substance may carry a positronemitting radioactive isotope. One or more detectors may be used tocapture emission of positrons emitted by such an isotope (e.g., bycapturing resulting gamma photons) to ultimately produce an image.Alternatively, any other substances may be injected into a patient, as atracing agent for PEM imaging or otherwise. An exemplary PEM system mayinclude the PEM FLEX SOLO II system by Naviscan PET Systems, Inc. of SanDiego Calif.

Another alternative imaging modality may include breast-specific gammaimaging (BSGI). In a use of BSGI, a patient may be injected with aradiotracer (e.g., Technicium isotope T-99), and a BSGI camera may beused to capture gamma radiation emitted by such a tracer. Cancerouscells may have a higher tendency to absorb certain gamma emittingradiotracers, which may result in cancerous lesions standing out underBSGI imaging. BSGI imaging may thus provide distinction betweencancerous tissue and non-cancerous tissue based on cellular activityrather than being based on tissue density. An exemplary BSGI system mayinclude the DILON 6800 by Dilon Technologies of Newport News, Va.

Various biopsy site marker devices are disclosed for use in markingbiopsy sites. One or more marker devices are disclosed in U.S. Pub. No.2005/0228311, entitled “Marker Device and Method of Deploying a CavityMarker Using a Surgical Biopsy Device,” published Oct. 13, 2005; U.S.Pat. No. 6,996,433, entitled “Imageable Biopsy Site Marker,” issued Feb.7, 2006; U.S. Pat. No. 6,993,375, entitled “Tissue Site Markers for InVivo Imaging,” issued Jan. 31, 2006; U.S. Pat. No. 7,047,063, entitled“Tissue Site Markers for In Vivo Imaging,” issued May 16, 2006; U.S.Pat. No. 7,229,417, entitled “Methods for Marking a Biopsy Site,” issuedJun. 12, 2007; U.S. Pat. No. 7,044,957, entitled “Devices for Definingand Marking Tissue,” issued May 16, 2006; U.S. Pat. No. 6,228,055,entitled “Devices for Marking and Defining Particular Locations in BodyTissue,” issued May 8, 2001; and U.S. Pat. No. 6,371,904, entitled“Subcutaneous Cavity Marking Device and Method,” issued Apr. 16, 2002.The disclosure of each of the above-cited U.S. Pat. No. and U.S. PatentApplication Publications is incorporated by reference herein.

SUMMARY OF THE INVENTION

The use of a biopsy device with PEM and/or BSGI may warrant features ortechniques that are different from those used with other imagingmodalities. For instance, with X-ray it may be desirable to have aradiopaque biopsy needle to be able to determine if the needle is in thecorrect location in the target tissue. To target in ultrasound, it maybe desirable for a biopsy probe needle has to have a good amount ofechogenecity to be visible in the modality. With MRI, the ability to seethe biopsy needle in the breast may mean that there should be noartifact in the needle to affect the targeted tissue area.

In a PEM and/or BSGI context, it may be desirable to incorporate anisotope (e.g., FDG isotope, isotope T-99, etc.) into at least a portionof targeting device and/or a biopsy device used to obtain a tissuesample. The presence of such an isotope in the biopsy device may permitor facilitate targeting in tissue, such as by facilitating verificationthat a targeted lesion has been reached. Such an isotope may beincorporated in a variety of biopsy device or system components,including but not limited to a portion of a biopsy needle, an obturator,or various portions of a targeting set, as will be described in greaterdetail below.

A biopsy target assembly comprising a sleeve having a proximal end, adistal end, and a side opening positioned proximal of the distal end ofthe sleeve; and an elongate member advanceable in the sleeve, theelongate member carrying at least one isotope. The sleeve may berelatively flexible, and may have an open distal end. The elongatemember may be relatively stiff, and may a tissue piercing distal tip.The isotope may be carried by the elongate member such that when theelongate member is advanced fully distally within the sleeve, theisotope is substantially aligned with the side opening in the sleeve.The isotope may be disposed a predetermined distance proximally of adistal end of the elongate member.

In another embodiment, the invention provides a biopsy target assembly.The assembly may include a guidance assembly; a sleeve mountpositionable with respect to the guide assembly; a sleeve releasablysupported on the sleeve mount; and a member advanceable in the sleeve,the member carrying at least one isotope.

In another embodiment, the invention provides a target assembly whichincludes a grid member forming part of a movable compression member forcompressing a patient's breast. The biopsy target assembly may include agrid plate comprising a plurality of openings; a guide insertable in oneof the grid plate openings, the guide having at least one guidepassageway therethrough; a sleeve insertable in the guide passageway ofthe guide; and a member advanceable in the sleeve, the member carryingat least one isotope.

BRIEF DESCRIPTION OF THE DRAWINGS

It is believed the present invention will be better understood from thefollowing description of certain examples taken in conjunction with theaccompanying drawings, in which like reference numerals identify thesame elements and in which:

FIG. 1 depicts a perspective view of an exemplary biopsy targetingassembly illustrating an isotope introducer comprising a relativelyrigid member, such as an obturator rod, inserted into a sleeve having anopen distal end and a side aperture, with the relatively rigid rodhaving an isotope portion generally aligned with the side aperture inthe sleeve when the relatively rigid member is inserted into the sleeve;

FIG. 1A depicts the relatively rigid member of FIG. 1 positioned in thesleeve such that an isotope portion (shown in phantom) is aligned with aside aperture in the sleeve.

FIG. 2 depicts an exploded view of an alternative embodiment of atargeting assembly.

FIG. 2A depicts an isotope introducer of the target assembly of FIG. 2.

FIG. 2B depicts the target assembly of FIG. 2 positioned in guidestructure inserted in one of a plurality of openings in a positioninggrid, such that a proximal portion of the target assembly is disposed onone side of the grid, and such that a distal portion of the targetassembly comprising an isotope portion is disposed on the other side ofthe grid.

FIG. 2C depicts a biopsy needle having a side tissue receiving opening,the biopsy needle extending through a guide structure inserted in apositioning grid, with a hollow cutter advanced distally in the needleto close the side tissue receiving opening, and with an introducercarrying an isotope portion advanced distally within the cutter toposition the isotope in substantial alignment with the side tissueopening in the needle.

FIG. 3 depicts a perspective view of an introducer useful forpositioning an isotope portion in or through a biopsy device, theintroducer including a relatively flexible hollow tube such as the typeused in flexible biopsy marker applications, and a relatively flexibleelongate member slidably insertable in the flexible hollow tube, withthe elongate member being sized and shaped to position the isotopeportion at a predetermined distance along the flexible hollow member'slength;

FIG. 3A illustrates the elongate member positioned in the hollow tube,with the isotope portion shown in phantom and spaced a predetermineddistance D from a closed, distal end of the hollow tube.

FIG. 3B illustrates the relatively flexible hollow tube deformed throughan angle A, such that the flexible hollow tube may be advanced along anon-linear path into a biopsy needle to position an isotope insubstantial alignment with a side opening in the biopsy needle.

FIG. 4 depicts a perspective view of another embodiment of an introducerhaving a generally flexible shaft with an isotope portion disposed at adistal end thereof, such as by attaching the isotope portion to thedistal end of the flexible shaft, or by inbedding or molding the istopeportion in a distal end portion of the shaft;

FIG. 5 depicts a perspective view of an introducer comprising anistotope portion extending through a biopsy device, such that a proximalend of the introducer extends proximally from the proximal end of thebiopsy device, and a distal end of the introducer associated with anisotope portion is disposed within an outer needle of the biopsy device;

FIG. 5A illustrates a hollow cutter advanced with a biopsy needle toclose off a side tissue opening in the needle, and an isotope advancedinto the cutter and aligned with the side tissue opening.

FIG. 6A depicts a top plan view of an exemplary biopsy needleincorporating an isotope;

FIG. 6B depicts a lateral side cross-section of the biopsy needle ofFIG. 6A showing a hollow cutter disposed within the biopsy needle and anisotope associated with a portion of the needle located below a sidetissue receiving aperture in the needle.

FIG. 7 depicts a biopsy device incorporating an isotope disposed aroundat least a portion of a side tissue receiving opening in the biopsyneedle;

FIG. 8 depicts a perspective view of an introducer having an elongatemember in the form of a rod, the rod having an isotope in the form of acoating or decal positioned on the rod in spaced relationship from thedistal end of the rod.

DETAILED DESCRIPTION

The following description of certain examples of the invention shouldnot be used to limit the scope of the present invention. Other examples,features, aspects, embodiments, and advantages of the invention willbecome apparent to those skilled in the art from the followingdescription, which is by way of illustration, one of the best modescontemplated for carrying out the invention. As will be realized, theinvention is capable of other different and obvious aspects, all withoutdeparting from the invention. Accordingly, the drawings and descriptionsshould be regarded as illustrative in nature and not restrictive.

FIGS. 1 and 1A depict one biopsy targeting assembly 50 in accordancewith the present invention that may be used with PEM, PET, BSGI, orother nuclear imaging systems utilizing an isotope or other radiationemitting source. The assembly shown can include similar structuresemployed in a targeting assembly described in one of published U.S.patent applications as being used in an MRI setting, such as US2007/0255168 and US 2008/0015429 incorporated by reference herein. Inaddition, the targeting assembly 50 of the present example shown in FIG.1 land FIG. 1A further includes an introducer 400 comprising an isotope,such as an isotope portion 420 (shown in Phantom in FIG. 2) visibleunder one or both of PET, PEM, and/or BSGI, and/or any other nuclearbased imaging system where an isotope is used to verify target location.

Referring to FIGS. 1 and 1A, the targeting assembly 50 can include asleeve assembly 100 supported by a sleeve mount 136. The assembly 50 canalso include a cradle assembly 60. Cradle assembly 60 may providesupport for a biopsy device having an outer biopsy needle and an innercutter. Assembly 60 may also support the sleeve mount 136, such as formotion along a direction into which the biopsy instrument needle and thesleeve 110 is to directed into tissue (z direction) indicated by arrow Ain FIG. 1. Sleeve assembly 100 may include an enlarged distal endportion 140 which may releasably latch to sleeve mount 136. The endportion 140 may include one or more internal seals for providing sealingaround the elongate member 408 when the member 408 is inserted into thesleeve assembly 100. The assembly may also include a cap 144 which mayinclude a through bore for receiving member 408, or alternatively cap144 may cover an opening in end portion 140 when the introducer 400 isremoved from the sleeve 1 10.

In the embodiment shown, the sleeve assembly 100 comprises a sleeve 110having an open distal end 114 and a side tissue receiving port 116.Alternatively, the sleeve may have a closed distal end, or the sleevemay have an open distal end with no side aperture 116. The sleeve 110may be formed of any suitable metallic or non-metallic material. In oneembodiment, the sleeve 110 is formed of biocompatible medical gradeplastic.

The isotope introducer 400 shown may comprise a plunger 402, and anelongate member 408, which may be in the form of a hollow orsubstantially solid rod. The introducer 400 may further include a distaltissue piercing tip 410 disposed at a distal end of the member 408. Inthose embodiments where member 408 includes a distal piercing tip 410,it can be advantageous to have elongate member 408 be relatively stiff.By ‘relatively stiff’ in this context, it is meant that the tip 410 ofthe introducer 400 may be inserted into sleeve 110 in a generallystraight line path and the tip 410 pressed or otherwise advanced into atissue mass without breaking, buckling, or otherwise excessivelydeforming the introducer 400. The introducer 400 may have a latch orother structure for releasably securing the introducer to the sleeveassembly 100, either directly or indirectly.

The introducer 400 may be formed of any suitable metallic ornon-metallic material, and in one embodiment may be formed of arelatively rigid medical grade, biocompatible plastic of sufficientcompressive rigidity and strength to advance tip 410 into tissue. Theintroducer may be sized and shaped such that when the elongate member408 is fully inserted into sleeve 110, the distal tip 410 extendsthrough the distal opening 114 of sleeve 110, and the isotope portion420 is generally aligned with the side tissue receiving port 116, asshown in FIG. 1A. The introducer 400 may be disposable, or may beadapted for repeated use.

The isotope portion 420 comprises one or more isotopes visible under oneof PET and/or BSGI, and may additionally include other materials, suchas one or more binder materials or encapsulating coatings for coveringthe one or more isotopes. The isotope portion 420 may comprise a liquid,a solid, a gas, or combinations thereof. The isotope portion may bedisposed within the elongate member 408, such as by being molded intothe member 408, or such as being disposed within a cavity within themember 408.

The sleeve 110 shown in FIGS. 1 and 1A has a side tissue receivingopening 116 disposed proximally of the distal open end 114. The opening116 may correspond with a transverse (side) opening in a biopsy needlethrough which tissue is received. After the isotope portion 420 has beenpositioned in the sleeve 110, the sleeve with isotope 420 may bepositioned with a tissue mass, and imaged using PET and/or BSGI todetermine the location of the side opening 116 with respect to thetissue mass.

The introducer 400 may then be removed from the sleeve 110, and thebiopsy device needle may be inserted into the sleeve such that theneedle side opening is substantially aligned with the side opening 116.A hollow cutter inside the biopsy probe may then be translated androtated within the needle to sever tissue prolapsed or otherwisereceived (such as by being drawn in by vacuum) through the side opening116 in the sleeve 110 and the side opening in the biopsy device.

The isotope introducer 400 in the example of FIG. 1 is inserted in thesleeve 110. The introducer 400 described above and shown in FIG. 1 andFIG. 1A can perform as an obturator, such as while the sleeve 110 isinserted into tissue. Alternatively, a separate obturator may beprovided and inserted with the sleeve into tissue, and the obturator maythen be removed from the sleeve while the sleeve remains in tissue to beimaged, and the introducer 400 may be inserted into the sleeve 110, suchthat isotope portion 420 is substantially aligned with the side opening116 while the sleeve is in tissue. Still further, in another embodimentthe isotope introducer 400 may be insertable into an otherwise separateobturator.

To the extent that the sleeve prevents certain portions of the isotoperod from being “visible” under an imaging modality, the side opening inthe sleeve may provide a window through which the isotope rod may bemore easily “seen” under the imaging system in use. Such visibility maythus help indicate the location of the sleeve's side opening, which mayin turn indicate the location of tissue that would be captured by abiopsy device whose needle is inserted into the sleeve after the isotoperod is withdrawn. The location and alignment of the isotope with theside opening may thus provide targeting of tissue.

In some uses, the location of target tissue may be predetermined, thesleeve may be inserted to reach the target, and the sleeve 110 andintroducer 400 may be viewed under PEM and/or BSGI to confirm properplacement of the side opening 116. Alternatively, the position of thesleeve may be adjusted in real time, while viewing both a suspiciouslesion and the location of the side opening 116 as indicated by theisotope rod showing through the transverse opening.

In accordance with one method of using the device in FIGS. 1 and 1A, themethod may include the steps of providing a composition to the patientwhich identifies or otherwise tags specific tissue mass cells (e.g.cancer cells) to be visible under PET and/or BSGI imaging, imaging thebreast using PET and/or BSGI, determine the location of the tissue massof interest, inserting the isotope introducer 400 into the sleeveassembly 100 to substantially align the isotope portion 420 with theside opening 116, set a depth of insertion for the sleeve assembly (e.g.z stop) based on location of the tissue mass of interest within thebreast, advance the sleeve assembly with introducer 400 into the breast,distal tip 410 first, and view or otherwise image the isotope portion420 (and so side opening 116) with respect to the tissue mass ofinterest.

FIGS. 2, 2A, and 2B illustrate another embodiment of the presentinvention. FIG. 2 illustrates a target assembly 500 comprising anobturator seal cap 510, an isotope introducer in the form of obturatorassembly 520, and a sleeve assembly 560. Obturator seal cap 510 may havea feature 512 adapted to lock and/or locate the cap 510 with respect toan obturator hub 522 of an obturator assembly 520.

Obturator assembly 520 may include an obturator hub 522 having a feature524 adapted to lock and/or locate the the obturator hub 522 with respectto the sleeve assembly 560. An obturator shaft 526, which may be hollowshaft, extends distally from hub 522 and may have a distal tissuepiercing tip 530. The obturator shaft 526 shown includes a surfacefeature 528, which may be in the form of a recess, notch, or cavity, inwhich the isotope portion 540 may be disposed. The feature 528 as showncomprises a recess extending through a wall of the hollow shaft 526,with recess 528 disposed proximally of the tip 530, and the recess 528may communicate with an internal lumen that extends distally from aproximal opening 523 of shaft 526. The isotope portion 540 may comprisea solid, liquid, and/or gas disposed in the recess 528, or may be acomponent molded or otherwise formed to fill or partially fill therecess 528.

The sleeve assembly 560 shown in FIG. 2 comprises a proximal sleeve base562, and a sleeve 564 having a proximal end 567 and the sleeve 564extending distally from base 562. The sleeve 564 is shown having a sideopening 566 and a distal open end 568, with a lumen extending betweenproximal end 567 and distal open end 568. The sleeve assembly 560 mayfurther comprise a duckbill seal 570 for providing a seal when obturatorshaft 526 is removed from sleeve assembly 560, a seal 572, such as awiper seal or lip seal for providing a seal around shaft 526 when theobturator shaft 526 is disposed within the sleeve assembly 560, and aseal retainer 574 adapted to retain seals 570 and 572 within a bore inbase 562.

FIG. 2A illustrates the isotope introducer, in the form of an obturatorassembly 520, with the obturator shaft 526 disposed within sleeve 564with a bottom surface 527 of shaft 526 facing the opening 566 (surface527 shown visible through opening 566 in FIG. 2A), such that recess 528in the obturator shaft 526 (and the isotope portion 540) faces downward,away from the side opening 566 formed in the sidewall in the sleeve, andsuch that the isotope 540 is substantially aligned (longitudinally) withthe opening 566.

The obturator shaft 526 may be inserted into the sleeve 564 so that thetip 530 extends from open distal end 530 of sleeve 564 and the isotope540 faces away from opening 566. By inserting the shaft 526 into sleeve564 such that the isotope portion 540 is substantially aligned with, butfaces away from side opening 566 formed in a sidewall of sleeve 564,tissue contact with the isotope portion may be avoided, and the need foran additional sleeve or protective cover between the isotope portion 540supported by shaft 526 and the opening 566 is avoided.

FIG. 2B illustrates the target assembly 500, with sleeve assembly 560supported in a grid member 580 having a plurality of openings 582therethrough. The sleeve assembly 560 extends through an opening in aguide member 590 sized and shaped to be received in one or more of theopenings 582. The guide member 590 supports the isotopeintroducer/obturator and the sleeve assembly relative to the grid member580. Grid member 580 may be provide a portion of a breast compressionmember and/or be movably supported relative to the patient's breast.

In one method of using the device shown in FIGS. 2, 2 a, and 2 b, thepatients's breast may be imaged using PET and/or BSGI to determine thelocation (e.g. spacial coordinates such as x, y, z cartesioncoordinates) of a target tissue lesion with respect to a referenceframe. The guide member 590 may then be placed in one of the openings582 based on the determined location (e.g. x, y coordinates) of thetarget tissue lesion. The obturator assembly may be positioned withinthe sleeve assembly such that the isotope portion 540 is substantiallyaligned with side opening 566 in the sleeve assembly, but with theisotope portion 540 facing downward, and substantially opposite opening566.

A z-stop device, such as depth ring stop 596 (FIG. 2B) may be employedto set the depth of insertion (z coordinate) of the side opening 566and/or tip 530 into the breast. As the sleeve and obturator are insertedinto the breast, the user may use PET and/or BSGI to view, in real time,the targeting set being inserted to the lesion site as it is penetratingthe breast.

The bottom surface 527 of obturator shaft 526 and sleeve 564, incombination, may act as a cover to prevent the isotope from coming intocontact with the breast tissue (e.g., for sterility reasons). Oncelocation is confirmed, then the obturator may be removed with theisotope, and the needle of a biopsy device may be inserted into thesleeve 564 to take tissue samples.

In other variations, the sleeve and/or obturator may include one or moreisotope portions (e.g., near the distal end of the sleeve and/orobturator). Such isotope portions may be internal (e.g., impregnated,etc.) and/or external (e.g., coatings or stickers, etc.).

FIG. 2C depicts another embodiment employing a grid 580. In FIG. 2C, aguide 590 is shown inserted in an opening in the grid 580. The guide hasa through bore sized and shaped to receive and support a biopsy needle1200 inserted in the bore to extend through the guide 590.

The biopsy needle 1200 shown in FIG. 2C is shown partially cut away toreveal a hollow cutter 1290 disposed within the needle 1200, and thecutter 1290 is shown partially cut away to reveal an isotope introducer300 disposed within the hollow cutter 1290.

The needle 1200 is shown having a distal tissue piercing tip 1202 and aside tissue receiving opening 1276 disposed proximally of the tip 1202.The biopsy needle 1200 is also shown having a plurality of depth(z-direction) indicating indicia 1204 on the outer surface of theneedle. The depth indicating indicia 1204 can be generally equidistantlyspaced apart along the longitudinal axis of the needle, and can take anysuitable form, such as for instance lines, ribs, indentations, and/orscore marks. The indicia can include numerical or color codedinformation for placement of the needle at a desired depth(z-coordinate) within the patient's breast.

In FIG. 2C, the distal cutting edge 1292 of the cutter 1290 is shownadvanced distally past the side opening 1276, so as to close the sideopening 1276 from the internal lumen of the needle 1200. In oneembodiment, the needle 1200 with side opening 1276 closed by cutter 1290can be advanced through the guide 590 into the patient's breast. Theisotope introducer 300 may then be advanced distally within the hollowcutter 1290 so that an isotope portion 340 associated with the distalend of the introducer 1290 is positioned in substantial alignment withthe side opening 1276 of needle 1200. The introducer 300 may be in theform of a relatively flexible or relatively rigid rod sized and shapedto pass through the hollow cutter 1290. The isotope portion 340 may bedisposed within the distal end of introducer 300 (as shown in phantom inFIG. 2C), or the portion 340 may be attached to the distal end of theintroducer 300.

The cutter 1290 as positioned in FIG. 2C may act as a shield orotherwise separate the isotope portion from direct contact with thepatient's tissue. The position of the isotope portion 340, aligned withthe side opening 1276, may be imaged using PET, PEM, BSGI, and/or anyother suitable nuclear imaging procedure, to verify that the opening1276 is positioned correctly with respect to the tissue mass ofinterest. If desired, the position of opening 1276 may be varied withrespect to the tissue of interest in real time using the imageinformation from the selected imaging procedure. Once the opening 1276is positioned in the desired location, the introducer and isotopeportion may be withdrawn from the cutter, and the cutter may beretracted proximally to position the cutter distal end 1292 at aposition proximal of the opening 1276. Vacuum may be provided throughthe cutter and/or a separate vacuum lumen to draw tissue into theopening 1276. The cutter may then be advanced distally to sever thetissue drawn into the opening 1276.

FIGS. 3 and 3A illustrate an isotope introducer assembly 600 accordingto another embodiment of the present invention, in which the assembly600 may be used to introduce and/or position an isotope with respect toa biopsy device. The introducer assembly 600 shown in FIG. 3 includes asleeve 610, a grip 620 disposed at or adjacent to an open proximal end612 of the sleeve 610 (grip not shown in FIG. 3A), and an introducercomponent 630 comprising a plunger 632 and an elongate introducer memberin the form of a rod 634. The sleeve 610 and the rod 634 can both berelatively flexible.

By “relatively flexible” in this context it is meant that the sleeve 610and insertion rod 634 may be resiliently bent or otherwise resilientdeformed through an angle of at least 60 degrees without breaking thesleeve 610 (or the member 634 within the sleeve) to permit the sleeve610 and member 634 to be inserted along a non-linear path, such as forinsertion in a biopsy device. In one particular embodiment, the sleeveand insertion rod may be resiliently bent through an angle of at leastabout 135 degrees without breaking.

FIG. 3B illustrates a sleeve 610 deformed through an angle A of betweenabout 60 and 90 degrees, for insertion in a proximal end of a biopsyneedle 1200, with a distal cutting edge 1292 of a hollow cutter 1290retracted proximally from the proximal end of the needle 1200. Thesleeve 610 can be in the form of a thin wall hollow tube having an openproximal end 612 and a closed distal end 614. As shown in FIG. 3A, thesleeve 610 can have an internal lumen 618 into which member 634 may beslidably inserted.

An isotope portion 640 may be operatively associated with a distalportion of member 634. For instance, in FIG. 3A the isotope portion 640(shown in phantom) may be disposed within the member 634, such as bymolding the member 634 around isotope portion 640, or otherwiseencapsulating the portion 640 within the member 634. In FIG. 3A, theisotope portion 640 is disposed a predetermined distance D from thedistal end of the sleeve 610 when member 634 is fully inserted intolumen 618 of sleeve 610. Alternatively, the portion 640 may be joined toa distal end of the member 634, or in yet another embodiment the isotopeportion may be a separate piece that is pushed by member 634 to adesired distance D from the distal end of the sleeve 610. In yet anotherembodiment, the rod 634 may be eliminated, and the isotope may beattached to or otherwise disposed within the sleeve 610, such as beingfixed within the hollow sleeve 610 at a predetermined distance from theend of sleeve 610.

The isotope portion 640 may contribute to the stiffness of the distalportion of the member 634. In one embodiment, the member 634 extendsproximally from the portion 640 a distance at least 10 times the axiallength of the portion 640, and the member 634 has a proximal portionextending intermediate the plunger 632 and the isotope portion 640,which proximal portion is more flexible than the distal portion of themember 634 associated with and encapsulating the isotope portion 640.Accordingly, in those cases where the portion 640 is a relatively short,stiff, relatively stiff component, the relatively more flexible proximalportion of the introducer member 634 permits the portion 640 to beadvanced along a non-linear path to a desire location.

When the sleeve 610 is inserted into a biopsy device, such as a biopsyneedle, the position of the isotope portion 640 relative to a feature ofthe biopsy needle, such as a side tissue receiving aperture, may beestablished based on various dimensions, such as for instance the lengthof the biopsy needle and the distance D. The isotope may be positionedin the distal portion of the sleeve 610 so that the isotope is alignedwith the side tissue receiving opening (in either a target set sleeve orthe biopsy needle) when the sleeve 610 is fully advanced within thebiopsy device. Using PET, PEM, BSGI, or other suitable nuclear imagingmethods, the position of the isotope (and so the side tissue receivingopening) can be confirmed with respect to the lesion of interest.

If desired, a kit of introducers may be provided, wherein at least someof the introducers 600 have a different characteristic dimension Dand/or at least some of the introducers have sleeves 610 and/orintroducer members with different lengths. A kit may also be providedwith one or more sleeves 610, and a plurality of members 634, eachmember 634 insertable in at least one sleeve, where one or more of themembers 634 have the isotope portion 640 disposed at a differentpositions along the length of the member 634. The members 634 andisotope portions 640 may be disposable or reusable. The distance D canbe provided such that the isotope is aligned with the side tissuereceiving opening in either a biopsy device and/or a target sleeve.

In one alternative, the sleeve 610 may also include a side aperture. Themember 634 may be inserted into sleeve 610, to position isotope portion640 for imaging. The member 634 may then be removed, and one or morebiopsy markers may be directed through sleeve to be deployed through theside opening in the sleeve. The biopsy markers may be directed throughthe sleeve alone, or the markers may delivered through the sleeve with atubular marker applier.

In another embodiment, the sleeve 610 may have a side opening, and thesleeve may be size to receive a biopsy needle such that a side tissueopening of the biopsy needle is aligned with the side opening of thesleeve 610. After the isotope portion 640 has been imaged with the sideopening of the sleeve 610 to confirm the side opening is in a desiredlocation, the member 634 may be removed from the sleeve 610, and thebiopsy needle may be advanced into the sleeve 610. A cutter may beadvanced through the biopsy needle to cut tissue received through thealigned side openings in the sleeve and biopsy needle. The biopsy needlemay then be removed, and one or ore markers may delivered through thesleeve. Alternatively, the biopsy needle may remain in place in thesleeve, the cutter may be retracted, and the markers may be deliveredthrough the biopsy needle to the aligned side openings in the sleeve 610and the biopsy needle.

In another embodiment, the isotope may be positionable at a plurality ofpredetermined locations along the length of the sleeve 610. Forinstance, the member 634 could include external ribs or ridges spacedalong the length of the member 634. As the member 634 is advanced orwithdrawn from sleeve 610, the ribs or ridges, when aligned with theproximal end 612 of the sleeve, would correspond to differentpredetermined distances D. Alternatively, the member 634 may haveindicia, such as color coded lines, numerical indicators, or lines ofvarious configuration and/or width, and/or other indicators along thelength of the member 634 to indicate predetermined positions to whichmember 634 may be inserted or withdrawn within the sleeve 610 to providedifferent distances D.

For instance, in FIG. 3A two indicia are shown in the form of arelatively thin line 636A and a relatively thick line 636B extendingaround the member 634. As the member 634 is advanced or withdrawn fromsleeve 610, the position of each indicia 636A/636B at the end 612 of thesleeve 610 correspond to two different predetermined distances D of theisotope 640 with respect to tip 614.

FIG. 4 illustrates an isotope introducer device 700 comprising anisotope introducer comprising a grip 710 and an elongate member 720having an isotope portion operatively associated with a distal end ofthe member 720. The isotope portion 740 may be joined to the distal endof member 720 using any suitable joining method, including by adhesivebonding, molding, or with a fastener. Alternatively, the portion 740 maybe spaced from the distal end of member 720 by a predetermined distance.The member 720 can comprise a relatively flexible rod or tube formed ofa medical grade, biocompatible plastic. The introducer in FIG. 4provides a one piece device for introducing an imageable isotope to adesired location with in a biopsy device, without requiring a plunger.

As yet another variation, an introducer device may include kit includingone or more flexible members 720, of the type shown in FIG. 4, and aplurality of tips that can be releasably joined to a distal portion ofthe member 720. The kit may include tips of various lengths, diameters,and/or isotope compositions. In yet another embodiment, the isotope maybe provided as a sticker or decal which may be affixed to a portion ofthe flexible member 720.

FIG. 5 illustrates a generalized biopsy device 1000 comprising a housing1100, a biopsy needle 1200 extending distally from the housing, and atissue sample container 1400 disposed at a proximal end of the housing 1100. The biopsy needle 1200 is shown having a side tissue receivingaperture 1216 and a distal piercing tip. An isotope introducer, such asone of the introducer device having one or more of the components shownin FIGS. 1-4 is shown inserted into the proximal end of the biopsydevice 1000, such as a proximal opening in the tissue sample compartment1400 communicating with a hollow cutter of the biopsy device.

In FIG. 5, the introducer is provided with sufficient length to extendsubstantially the full length of the biopsy device 1000, from a plunger1502 disposed proximal of the compartment 1400, to a distal portion ofthe introducer labeled 1530, shown aligned with and visible through theside tissue receiving opening in FIG. 5. The distal portion 1530 maycarry or enclose an isotope portion, or alternatively the distal portion1530 may be the isotope portion.

In those embodiments where the biopsy device includes a hollow internalcutter which translates and rotates within the biopsy needle 1200, theisotope introducer and isotope portion may be sized and shaped to passthrough the hollow internal cutter. The biopsy device may include aproximal opening communicating with hollow lumen of the internal cutter.The cutter may be advanced distally to close the side opening in theneedle, such that the distal portion of the cutter is disposed in thedistal portion of the needle 1200.

The isotope portion can then be advanced through the hollow cutter suchthat the isotope is aligned with the side opening in the needle, butspaced from the side opening in the needle by the cutter. Such anarrangement has the advantage that the cutter prevents direct contactbetween the isotope portion and the tissue adjacent the side opening inthe biopsy needle. FIG. 5A illustrates a hollow cutter 1290 having anopen distal cutting edge 1292 advanced distally within biopsy needle1200 beyond the distal end of side opening 1276, so that the upper sidewall of the cutter closes the side opening 1276. FIG. 5A alsoillustrates the isotope portion 1530 advanced into the hollow cutter andaligned within the cutter with the side opening 1276. Once the isotopeis imaged to confirm the location of the side opening 1276, the isotopemay be withdrawn proximally through the cutter, the cutter may beretracted proximally to open the side opening 1276, tissue may be drawn(e.g. by vacuum) into the opening 1276, and the cutter may be advanceddistally to sever the tissue with cutting edge 1292. Alternatively, thecutter may be retracted proximally of the biopsy needle side opening,and the isotope may be advanced through the biopsy needle. Andsubstantially aligned with the side tissue receiving opening in thebiopsy needle 1200.

The isotope may be positioned in the biopsy needle 1200 prior to theinsertion of the needle 1200 into the breast. Generally, it is desirableto have the side tissue opening 1276 closed or at least substantiallyclosed when the needle 1200 is inserted in the breast. The opening 1276may be closed by advancing the cutter to close the opening 1276, oralternatively, the isotope portion and introducer member may be advancedthrough the cutter to close off the opening 1276 (where the isotopeportion and introducer member are sized and shaped to fit down theinside of the hollow inner cutter), or the hollow internal cutter may beretracted, and the isotope portion and introducer can be advanced toclose off the opening 1276. For instance, in FIG. 5, a distal portion1530 of the isotope introducer is shown closing off the opening 1276.The needle 1200 with isotope disposed within the needle can be imaged,such as by using PET or BSGI. Then, the isotope and introducer can beremoved from the needle 1200, and the inner hollow cutter can beadvanced to sever tissue received in the opening 1276.

In some variations, a movable sleeve or other component is providedabout needle 1200, permitting at least a portion the isotope rod to becovered, such as to prevent the rod from touching tissue through thetransverse opening. Alternatively, a cutter within the needle mayprovide at least some degree of cover for the isotope rod, as disclosedabove. A member may be used to introduce (e.g. by carrying or pushing)the isotope, with the member configured to fit within the inner diameterof a hollow tubular cutter disposed within the outer needle. The cuttermay be advanced distally (e.g., to “close off” the transverse opening)as the needle is inserted into tissue, and the cutter may be retractedat least partially to “reveal” the isotope rod when the needle isdisposed in tissue.

FIG. 6A and FIG. 6B show a modification that may be provided in a biopsyneedle to provide imaging of a tissue receiving opening under PET and/orBSGI. FIG. 6A is a top view of a needle 1400, and FIG. 6B is a schematiccross-section taken along lines 6-6 in FIG. 6A.

The biopsy needle 1400 of FIGS. 6A and 6B has a tissue piercing closedtip 1423, a side (transverse) opening 1416, and a perforated vacuum wall1434 disposed below the opening 1416. Vacuum wall 1434 has a pluralityof openings 1436 there through for communicating vacuum provided througha vacuum passageway 1438. The vacuum passageway 1438 is disposed belowan inner hollow cutter 1600. Cutter 1600 has an open distal cutting end1610, and cutter 1600 is translatable and rotatable within a cutterlumen of needle 1400.

As shown in the Figures, an isotope imageable under PET and/or BSGI maybe disposed on the vacuum wall 1434. Accordingly, the opening 1416 willbe relatively more visable under PET and/or BSGI. While the wall 1434 isshown as extending only part of the length of the needle in thisexample, other variations may have a wall extending the full length ofthe needle.

For instance, the wall 1434 may be coated or impregnated with anisotope. Accordingly, when the wall is “revealed” through the transverseopening of the needle, such as when cutter 1600 is retracted proximally,the wall may be seen via PEM and/or BSGI imaging. Being on or in thewall, within the needle, may prevent the isotope from coming into directcontact with tissue (e.g., tissue that is not being severed by thecutter). In some applications, the isotope may be imageable via PEMand/or BSGI, even with the cutter translated distally (e.g., the wallcan be “seen” through the cutter using the imaging technique).

FIG. 7 illustrates a biopsy device 1600 comprising a biopsy needle 1800having a distal piercing tip 1810 and a side opening 1800. In theembodiment of FIG. 7, an isotope visible under PEM and/or BSGI isassociated with at least a portion of the perimeter of the opening 1816.In FIG. 7, the isotope is shown in the form of a decal 1840 thatsubstantially surrounds the opening 1816, to provide imaging of theperimeter of the opening 1816 under PET and/or BSGI.

The decal comprising the isotope may be applied to the needle justbefore the biopsy procedure, as opposed to when the needle ismanufactured. After the biopsy procedure is complete, the sticker may beremoved from the needle and disposed of properly. The decal 1840 maycomprise a first outer layer, such as a coating or film layersubstantially impervious to moisture, and a second inner layercomprising the isotope used in imaging. The outer layer can be employedto prevent contact of the isotope with the tissue. Alternatively, theperimeter of the side opening may be impregnated with the isotope, orthe isotope may be provided as a coating about the perimeter of theopening.

While the isotope sticker of the present example is shown in FIG. 7 asextending about the full perimeter of the transverse opening, it will beappreciated an isotope sticker (or other type of isotope marking) neednot extend about the full perimeter of a transverse opening. Forinstance, in some versions, only the distal and proximal edges aremarked. In any case, it will be appreciated that the isotope sticker ofthe present example may make the transverse opening of the probe needlestand out under PEM and/or BSGI imaging, which may facilitate real timetargeting and/or for confirmation of proper needle location as describedabove.

FIG. 8 depicts a perspective view of an isotope introducer device 2000comprising a grip 2020 and an elongate member 2010 extending distallyfrom the grip. The elongate member may be a flexible rod or tube, oralternatively, the elongate member 2010 may be in the form of arelatively rigid rod or tube. An isotope portion 2040 may be disposed onan outer surface of the member 2010, such as in a predetermined spacedrelation from the distal end 2012 of member 2010. The isotope portion2040 may be in the form of a releasable decal or coating applied to themember 2010. After the biopsy procedure is complete, the sticker may beremoved from the member 2010 and disposed of properly.

In one embodiment, a kit may be provided having one or more introducerdevices 2000. The devices 2000 can be provided with elongate membershaving different lengths and/or isotope portions disposed at differentpositions relative to the distal ends of the devices. The isotopecarrying decals may be provided in the kit, or separately, such that theposition of the isotope on the elongate member can be selected at thetime of use. The decals can be provided in different lengths and/orwidths to accommodate different sizes of isotope introducers and/orbiopsy devices.

While certain specific isotopes have been mentioned herein, it will beappreciated that any other suitable isotope may be used, as well as anysuitable combinations of isotopes. Such alternative isotopes may provideemission of positrons, gamma radiation, or any other suitable type ofemission or radiation. Furthermore, while PEM and BSGI are described inmany of the examples herein as exemplary imaging modalities, it will beappreciated that any other suitable imaging modalities may be used,including combinations thereof. In other words, devices disclosed hereinmay be used in a variety of settings, including those in which someimaging modality or modalities other than PEM and BSGI are used,including but not limited to MRI, x-ray, modalities detecting radiationemitted from a patient, etc. Suitable alternative imaging modalitieswill be apparent to those of ordinary skill in the art in view of theteachings herein. To the extent that alternative imaging modalities areused, the devices described herein may be used with such alternativeimaging modalities with or without further modifications to the devicesdescribed herein. Suitable modifications to the devices describedherein, for use with PEM or BSGI imaging or any other imagingmodalities, will be apparent to those of ordinary skill in the art inview of the teachings herein.

Embodiments of the present invention may have application inconventional endoscopic and open surgical instrumentation as well asapplication in robotic-assisted surgery.

Embodiments of the devices disclosed herein can be designed to bedisposed of after a single use, or they can be designed to be usedmultiple times. Embodiments may, in either or both cases, bereconditioned for reuse after at least one use. Reconditioning mayinclude any combination of the steps of disassembly of the device,followed by cleaning or replacement of particular pieces, and subsequentreassembly. In particular, embodiments of the device may bedisassembled, and any number of the particular pieces or parts of thedevice may be selectively replaced or removed in any combination. Uponcleaning and/or replacement of particular parts, embodiments of thedevice may be reassembled for subsequent use either at a reconditioningfacility, or by a surgical team immediately prior to a surgicalprocedure. Those skilled in the art will appreciate that reconditioningof a device may utilize a variety of techniques for disassembly,cleaning/replacement, and reassembly. Use of such techniques, and theresulting reconditioned device, are all within the scope of the presentapplication.

By way of example only, embodiments described herein may be processedbefore surgery. First, a new or used instrument may be obtained and ifnecessary cleaned. The instrument may then be sterilized. In onesterilization technique, the instrument is placed in a closed an sealedcontainer, such as a plastic or TYVEK bag. The container and instrumentmay then be placed in a field of radiation that can penetrate thecontainer, such as gamma radiation, x-rays, or high-energy electrons.The radiation may kill bacteria on the instrument and in the container.The sterilized instrument may then be stored in the sterile container.The sealed container may keep the instrument sterile until it is openedin a medical facility. A device may also be sterilized using any othertechnique known in the art, including but not limited to beta or gammaradiation, ethylene oxide, or steam.

Having shown and described various embodiments of the present invention,further adaptations of the methods and systems described herein may beaccomplished by appropriate modifications by one of ordinary skill inthe art without departing from the scope of the present invention.Several of such potential modifications have been mentioned, and otherswill be apparent to those skilled in the art. For instance, theexamples, embodiments, geometries, materials, dimensions, ratios, steps,and the like discussed above are illustrative and are not required.Accordingly, the scope of the present invention should be considered interms of the following claims and is understood not to be limited to thedetails of structure and operation shown and described in thespecification and drawings.

1. A biopsy target assembly comprising: a sleeve having a proximal end,a distal end, and a side opening positioned proximal of the distal endof the sleeve; and an elongate member advanceable in the sleeve, theelongate member carrying at least one isotope.
 2. The biopsy targetassembly of claim 1 wherein the sleeve has an open distal end.
 3. Thebiopsy target assembly of claim 1 wherein the elongate member has atissue piercing distal tip.
 4. The biopsy target assembly of claim 1wherein the isotope is carried by the elongate member such that when theelongate member is advanced within the sleeve, the isotope issubstantially aligned with the side opening in the sleeve.
 5. The biopsytarget assembly of claim 1 wherein the isotope is disposed proximally ofa distal end of the elongate member.
 6. The biopsy target assembly ofclaim 1 wherein the elongate member carries a Technicium Isotope T-99.7. The biopsy target assembly of claim 1 wherein the elongate membercarries a material comprising fluorodeoxyglucose.
 8. The biopsy targetassembly of claim 1 wherein the at least one isotope is disposed withinthe elongate member.
 9. The biopsy target assembly of claim 1 whereinthe at least one isotope is disposed on a surface of the elongatemember.
 10. The biopsy target assembly of claim 1, wherein the sleeve isdisposable and wherein the elongate member is reusable.
 11. A biopsytarget assembly comprising: a guidance assembly; a sleeve mountpositionable with respect to the guide assembly; a sleeve releasablysupported on the sleeve mount; and a member advanceable in the sleeve,the member carrying at least one isotope.
 12. A biopsy target assemblycomprising: a grid plate comprising a plurality of openings; a guideinsertable in one of the grid plate openings, the guide having at leastone guide passageway therethrough a sleeve insertable in the guidepassageway of the guide; and a member advanceable in the sleeve, themember carrying at least one isotope.